Camera optical lens

ABSTRACT

The present disclosure provides a camera optical lens including eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power; a second lens having a positive refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a negative refractive power; a sixth lens having a positive refractive power; a seventh lens having a negative refractive power; and an eight lens having a negative refractive power; wherein the camera optical lens satisfies conditions of: 0.95≤f/TTL; 3.00≤f2/f≤4.50; and 0.20≤(R5+R6)/(R5−R6)≤0.90. The camera optical lens can achieve good optical performance while meeting the design requirements for large aperture, long focal length and ultra-thinness.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, particular, to a camera optical lens suitable for handheld devices, such as smart phones and digital cameras, and imaging devices, such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lens with good imaging quality therefore have become a mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece, four-piece, or even five-piece or six-piece lens structure. However, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality is improving constantly, the eight-piece lens structure gradually appears in lens designs. Although the typical eight-piece lens already has good optical performance, its optical power, lens spacing and lens shape remain unreasonable to some extents, resulting in that the lens structure, which, even though, has excellent optical performance, is not able to meet the design requirement for large aperture, ultra-thinness and long focal length.

Thus, there is a need to provide a camera optical lens having excellent optical performance and meeting the design requirement for large aperture, ultra-thinness and long focal length.

SUMMARY

To address the above issues, an object of the present disclosure is to provide a camera optical lens that meets a design requirement of large aperture, ultra-thinness and long focal length while having excellent optical performance.

For solving the aforementioned problem, a camera optical lens is provided, including eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power; a second lens having a positive refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a negative refractive power; a sixth lens having a positive refractive power; a seventh lens having a negative refractive power; and an eight lens having a negative refractive power; the camera optical lens satisfies conditions of: 0.95≤f/TTL; 3.00≤f2/f≤4.50; and 0.20≤(R5+R6)/(R5−R6)≤0.90; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens.

As an improvement, the camera optical lens further satisfies a condition of: 1.90≤d5/d4≤3.00; where d4 denotes an on-axis distance from an image-side surface of the second lens to the object-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.

As an improvement, the camera optical lens further satisfies conditions of: 0.47≤f1/f≤2.00; −8.45≤(R1+R2)/(R1−R2)≤−1.60; and 0.06≤d1/TTL≤0.25; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.

As an improvement, the camera optical lens further satisfies conditions of: −86.93≤(R3+R4)/(R3−R4)≤−12.39; and 0.02≤d3/TTL≤0.06; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.

As an improvement, the camera optical lens further satisfies conditions of: 0.45≤f3/f≤1.98; and 0.04≤d5/TTL≤0.19; where f3 denotes a focal length of the third lens; and d5 denotes an on-axis thickness of the third lens.

As an improvement, the camera optical lens further satisfies conditions of: −2.85≤f4/f≤−0.57; 0.64≤(R7+R8)/(R7−R8)≤3.97; and 0.02≤d7/TTL≤0.05; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.

As an improvement, the camera optical lens further satisfies conditions of: −11.19≤f5/f≤−1.94; −7.18≤(R9+R10)/(R9−R10)≤−0.31; and 0.02≤d9/TTL≤0.06; where f5 denotes a focal length of the fifth lens; R9 denotes a central curvature radius of an object-side surface of the fifth lens; R10 denotes a central curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.

As an improvement, the camera optical lens further satisfies conditions of: 0.77≤f6/f≤2.78; 1.98≤(R11+R12)/(R11−R12)≤9.59; and 0.03≤d11/TTL≤0.10; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.

As an improvement, the camera optical lens further satisfies conditions of: −3.65≤f7/f≤−0.82; 0.54≤(R13+R14)/(R13−R14)≤1.94; and 0.03≤d13/TTL≤0.08; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.

As an improvement, the camera optical lens further satisfies conditions of: −3.55≤f8/f≤−1.03; −1.70≤(R15+R16)/(R15−R16)≤1.53; and 0.03≤d15/TTL≤0.09; where f8 denotes a focal length of the eighth lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens.

The present disclosure is advantageous in: the camera optical lens in the present disclosure has good optical performance and has characteristics of large aperture, long focal length and ultra-thinness (in a camera optical lens with long focal length), and is especially applicable to mobile phone camera lens assemblies and WEB camera lenses composed by such camera elements as CCD and CMOS for high pixels.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate the technical solutions according to the embodiments of the present disclosure or in the prior art more clearly, the accompanying drawings for describing the embodiments or the prior art are introduced briefly in the following. Apparently, the accompanying drawings in the following description are only some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of a structure of a camera optical lens according to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1.

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1.

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1.

FIG. 5 is a schematic diagram of a structure of a camera optical lens according to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5.

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5.

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5.

FIG. 9 is a schematic diagram of a structure of a camera optical lens according to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9.

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9.

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DETAILED DESCRIPTION OF EMBODIMENTS

To make the objects, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawing, the present disclosure provides a camera optical lens 10. FIG. 1 shows a camera optical lens 10 of Embodiment 1 of the present disclosure, and the camera optical lens 10 includes eight lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side in sequence: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8. An optical element such as an optical filter GF can be arranged between the eighth lens L8 and an image surface Si.

In this embodiment, the first lens L1 has a positive refractive power, the second lens L2 has a positive refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a negative refractive power, the sixth lens L6 has a positive refractive power, the seventh lens L7 has a negative refractive power and the eighth lens L8 has a negative refractive power. In this embodiment, the first lens L1 has a positive refractive power, which facilitates reduction of the overall length of the camera optical lens.

In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are made of plastic material. In other embodiments, the lenses may be made of other material.

In this embodiment, a total optical length from the object-side surface of the first lens L1 to an image surface Si of the camera optical lens 10 along an optical axis is defined as TTL, and a focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of 0.95≤f/TTL, which specifies a ratio of the focal length of the camera optical lens 10 and the total optical length of the camera optical lens 10. Given a same optical length, the camera optical lens 10 has the focal length longer.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the second lens L2 is defined as f2. The camera optical lens 10 satisfies a condition of 3.00≤f2/f≤4.50, which specifies a ratio of the focal length of the second lens L2 to the focal length of the camera optical lens 10. Within this condition, correction of the aberration is facilitated, and quality for imaging is improved.

A central curvature radius of the object-side surface of the third lens L3 is defined as R5, and a central curvature radius of the image-side surface of the third lens L3 is defined as R6. The camera optical lens 10 satisfies a condition of 0.20≤(R5+R6)/(R5−R6)≤0.90, which specifies a shape of the third lens L3. Within this condition, the deflection degree of the light passing through the lens can be alleviated, and the aberration can be effectively reduced.

An on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3 is defined as d4, and an on-axis thickness of the third lens L3 is defined as d5. The camera optical lens 10 satisfies a condition of 1.90≤d5/d4≤3.00, which specifies a ratio of the on-axis thickness of the third lens L3 and the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3. Within this condition, lens manufacturing and assembly of the camera optical lens are facilitated.

In this embodiment, the first lens L1 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens is defined as f1. The camera optical lens 10 satisfies a condition of 0.47≤f1/f≤2.00, which specifies a ratio of the focal length of the first lens L1 to the focal length of the camera optical lens 10. Within this condition, the first lens L1 has an appropriate positive refractive power, the correction of the aberration of the camera optical lens is facilitated, and meanwhile the development of the lenses towards ultra-thinness is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.75≤f1/f≤1.60.

A central curvature radius of an object-side surface of the first lens L1 is defined as R1, and a central curvature radius of an image-side surface of the first lens L1 is defined as R2. The camera optical lens 10 satisfies a condition of −8.45≤(R1+R2)/(R1−R2)≤−1.60. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct a spherical aberration of the camera optical lens. Preferably, the camera optical lens 10 satisfies a condition of −5.28≤(R1+R2)/(R1−R2)≤−2.00.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the first lens L1 is defined as d1. The camera optical lens 10 satisfies a condition of 0.06≤d1/TTL≤0.25. This can facilitate achieving ultra-thinness of the lenses. Preferably, the camera optical lens 10 satisfies a condition of 0.10≤d1/TTL≤0.20.

In this embodiment, the second lens L2 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

A central curvature radius of the object-side surface of the second lens L2 is defined as R3, and a central curvature radius of the image-side surface of the second lens L2 is defined as R4. The camera optical lens 10 satisfies a condition of −86.93≤(R3+R4)/(R3−R4)≤−12.39, which specifies a shape of the second lens L2. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the on-axis chromatic aberration. Preferably, the camera optical lens 10 satisfies a condition of −54.33≤(R3+R4)/(R3−R4)≤−15.49.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the second lens L2 is defines as d3. The camera optical lens 10 satisfies a condition of 0.02≤d3/TTL≤0.06. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.03≤d3/TTL≤0.05.

In this embodiment, the third lens L3 includes an object-side surface being convex in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the third lens L3 is defined as f3. The camera optical lens 10 satisfies a condition of 0.45≤f3/f≤1.98. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of 0.71≤f3/f≤1.58.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the third lens L3 is defined as d5. The camera optical lens 10 satisfies a condition of 0.04≤d5/TTL≤0.19. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.06≤d5/TTL≤0.15.

In this embodiment, the fourth lens L4 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fourth lens L4 is defined as f4. The camera optical lens 10 satisfies a condition of −2.85≤f4/f≤−0.57. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −1.78≤f4/f≤−0.72.

A central curvature radius of the object-side surface of the fourth lens L4 is defined as R7, and a central curvature radius of the image-side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 satisfies a condition of 0.64≤(R7+R8)/(R7−R8)≤3.97, which specifies a shape of the fourth lens L4. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies a condition of 1.02≤(R7+R8)/(R7−R8)≤3.18.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the fourth lens L4 is defined as d7. The camera optical lens 10 satisfies a condition of 0.02≤d7/TTL≤0.05. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.03≤d7/TTL≤0.04.

In this embodiment, the fifth lens L5 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fifth lens L5 is defined as f5. The camera optical lens 10 satisfies a condition of −11.19≤f5/f≤−1.94, which specifies the fifth lens L5 so as to enable the light angle of the camera optical lens 10 to be gradual and reduce the tolerance sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −6.99≤f5/f≤−2.43.

A central curvature radius of the object-side surface of the fifth lens L5 is defined as R9, and a central curvature radius of the image-side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 satisfies a condition of −7.18≤(R9+R10)/(R9−R10)≤−0.31, which specifies a shape of the fifth lens L5. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies a condition of −4.49≤(R9+R10)/(R9−R10)≤−0.39.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the fifth lens L5 is defined as d9. The camera optical lens 10 satisfies a condition of 0.02≤d9/TTL≤0.06. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.03≤d9/TTL≤0.05.

In this embodiment, the sixth lens L6 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the sixth lens L6 is defined as f6. The camera optical lens 10 satisfies a condition of 0.77≤f6/f≤2.78. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of 1.23≤f6/f≤2.22.

A central curvature radius of an object-side surface of the sixth lens L6 is defined as R11, and a central curvature radius of an image-side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 satisfies a condition of 1.98≤(R11+R12)/(R11−R12)≤9.59, which specifies a shape of the sixth lens L6. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies a condition of 3.17≤(R11+R12)/(R11−R12)≤7.67.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the sixth lens L6 is defined as d11. The camera optical lens 10 satisfies a condition of 0.03≤d11/TTL≤0.10. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.05≤d11/TTL≤0.08.

In this embodiment, the seventh lens L7 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the seventh lens L7 is defined as f7. The camera optical lens 10 satisfies a condition of −3.65≤f7/f≤−0.82. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −2.28≤f7/f≤−1.02.

A central curvature radius of the object-side surface of the seventh lens L7 is defined as R13, and a central curvature radius of the image-side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 satisfies a condition of 0.54≤(R13+R14)/(R13−R14)≤1.94, which specifies a shape of the seventh lens L7. Within this range, the deflection of light passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, the camera optical lens 10 satisfies a condition of 0.87≤(R13+R14)/(R13−R14)≤1.55.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the seventh lens L7 is defined as d13. The camera optical lens 10 satisfies a condition of 0.03≤d13/TTL≤0.08. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.04≤d13/TTL≤0.07.

In this embodiment, the eighth lens L8 includes an object-side surface being concave in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the eighth lens L8 is defined as f8. The camera optical lens 10 satisfies a condition of −3.55≤f8/f≤−1.03. With reasonable distribution of the refractive power, the camera optical lens has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −2.22≤f8/f≤−1.28.

A central curvature radius of the object-side surface of the eighth lens L8 is defined as R15, and a central curvature radius of the image-side surface of the eighth lens L8 is defined as R16. The camera optical lens 10 satisfies a condition of −1.70≤(R15+R16)/(R15−R16)≤1.53, which specifies a shape of the eighth lens L8. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies a condition of −1.06≤(R15+R16)/(R15−R16)≤1.22.

The total optical length of the camera optical lens 10 is defined as TTL, and an on-axis thickness of the eighth lens L8 is defined as d15. The camera optical lens 10 satisfies a condition of 0.03≤d15/TTL≤0.09. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.04≤d15/TTL≤0.08.

In this embodiment, an image height of the camera optical lens 10 is defined as IH, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of TTL/IH≤2.30, which facilitates ultra-thinness of the lenses.

In this embodiment, the image height of the camera optical lens 10 is defined as IH, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of f/IH≥2.25, which facilitates achieving long focal length and excellent imaging performance of the camera optical lens 10.

In this embodiment, an F number of the camera optical lens 10 is defined as FNO, and the camera optical lens 10 satisfies a condition of FNO≤1.92. This facilitates achieving large aperture and excellent imaging performance of the camera optical lens 10.

In this embodiment, the focal length of the camera optical lens 10 is defined as f, and a combined focal length of the first lens L1 and of the second lens L2 is defined as f12. The camera optical lens 10 satisfies a condition of 0.36≤f12/f≤1.53. Within this condition, the aberration and distortion of the camera optical lens 10 can be eliminated and a back focal length of the camera optical lens is reduced, thereby maintaining miniaturization of the camera optical lens. Preferably, the camera optical lens 10 satisfies a condition of 0.58≤f12/f≤1.23.

It should be appreciated that, in other embodiments, configuration of the object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have a distribution in convex and concave other than that of the above-discussed embodiment.

When the above relationships are satisfied, the camera optical lens 10 meets the design requirements of large aperture, long focal length and ultra-thinness (in a camera optical lens with long focal length) while having excellent optical imaging performance. Based on the characteristics of the camera optical lens 10, the camera optical lens 10 is particularly applicable to mobile camera lens assemblies and a WEB camera lenses composed of such camera elements as CCD and CMOS for high pixels.

The camera optical lens 10 will be further described with reference to the following examples. Symbols used in various examples are shown as follows. The focal length, on-axis distance, central curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Total optical length (the distance from the object-side surface of the first lens L1 to the image surface Si of the camera optical lens along the optical axis) in mm.

FNO: ratio of an effective focal length and an entrance pupil diameter of the camera optical lens.

Preferably, inflexion points and/or arrest points can be arranged on the object-side surface and/or the image-side surface of each lens, so as to satisfy the demand for high quality imaging. The description below can be referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of the present disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd νd S1 ∞ d0= −1.065 R1 3.056 d1= 1.158 nd1 1.5444 ν1 55.82 R2 4.951 d2= 0.129 R3 2.548 d3= 0.311 nd2 1.6800 ν2 18.40 R4 2.668 d4= 0.382 R5 11.314 d5= 1.142 nd3 1.5444 ν3 55.82 R6 −6.896 d6= 0.050 R7 12.504 d7= 0.320 nd4 1.6800 ν4 18.40 R8 4.707 d8= 0.788 R9 −15.950 d9= 0.380 nd5 1.6800 ν5 18.40 R10 −104.390 d10= 0.493 R11 −6.957 d11= 0.563 nd6 1.6800 ν6 18.40 R12 −4.152 d12= 0.050 R13 134.031 d13= 0.500 nd7 1.5444 ν7 55.82 R14 5.755 d14= 1.364 R15 −8.482 d15= 0.500 nd8 1.5444 ν8 55.82 R16 104.113 d16= 0.400 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.400

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: central curvature radius of an optical surface;

R1: central curvature radius of the object-side surface of the first lens L1;

R2: central curvature radius of the image-side surface of the first lens L1;

R3: central curvature radius of the object-side surface of the second lens L2;

R4: central curvature radius of the image-side surface of the second lens L2;

R5: central curvature radius of the object-side surface of the third lens L3;

R6: central curvature radius of the image-side surface of the third lens L3;

R7: central curvature radius of the object-side surface of the fourth lens L4;

R8: central curvature radius of the image-side surface of the fourth lens L4;

R9: central curvature radius of the object-side surface of the fifth lens L5;

R10: central curvature radius of the image-side surface of the fifth lens L5;

R11: central curvature radius of the object-side surface of the sixth lens L6;

R12: central curvature radius of the image-side surface of the sixth lens L6;

R13: central curvature radius of the object-side surface of the seventh lens L7;

R14: central curvature radius of the image-side surface of the seventh lens L7;

R15: central curvature radius of an object-side surface of the eighth lens L8;

R16: central curvature radius of an image-side surface of the eighth lens L8;

R17: central curvature radius of an object-side surface of the optical filter GF;

R18: central curvature radius of an image-side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object-side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image-side surface of the optical filter GF to the image surface S1;

nd: refractive index of the d line;

nd1: refractive index of the d line of the first lens L1;

nd2: refractive index of the d line of the second lens L2;

nd3: refractive index of the d line of the third lens L3;

nd4: refractive index of the d line of the fourth lens L4;

nd5: refractive index of the d line of the fifth lens L5;

nd6: refractive index of the d line of the sixth lens L6;

nd7: refractive index of the d line of the seventh lens L7;

nd8: refractive index of the d line of the eighth lens L8;

ndg: refractive index of the d line of the optical filter GF;

νd: abbe number;

ν1: abbe number of the first lens L1;

ν2: abbe number of the second lens L2;

ν3: abbe number of the third lens L3;

ν4: abbe number of the fourth lens L4;

ν5: abbe number of the fifth lens L5;

ν6: abbe number of the sixth lens L6;

ν7: abbe number of the seventh lens L7;

ν8: abbe number of the eighth lens L8;

νg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −1.7798E−01 −2.0663E−03 1.3493E−03  2.1495E−05 −1.4138E−04   3.4850E−05 R2  2.8180E+00 −1.6356E−01 2.0865E−01 −1.5687E−01 7.5919E−02 −2.4344E−02 R3 −9.9283E+00 −1.7872E−01 2.7083E−01 −2.2299E−01 1.1342E−01 −3.7026E−02 R4 −8.8992E+00 −8.8281E−02 1.7368E−01 −1.7281E−01 1.0040E−01 −3.6026E−02 R5  1.0000E+01  1.2690E−02 2.0651E−02 −3.5696E−02 2.3726E−02 −8.0720E−03 R6 −2.0000E+01  1.8462E−01 −3.1105E−01   2.7805E−01 −1.5009E−01   5.1234E−02 R7  6.2310E+00  1.3476E−01 −2.9294E−01   2.6055E−01 −1.2426E−01   3.0696E−02 R8 −5.0648E+00 −1.8268E−03 −5.1398E−02   4.4211E−02 −1.0205E−02  −4.9596E−03 R9 −4.1867E+00 −5.1153E−03 −2.5672E−02   2.1275E−02 −1.0076E−02   2.2786E−03 R10 −1.0000E+01 −1.3023E−04 −2.5597E−02   2.2150E−02 −1.2246E−02   4.2048E−03 R11  4.2881E−01  1.6343E−02 −1.8992E−02   2.8997E−03 6.1704E−03 −6.5953E−03 R12 −5.5456E+00 −2.0910E−02 2.5206E−02 −2.6047E−02 1.6479E−02 −7.0947E−03 R13  1.0000E+01 −1.1483E−01 7.5678E−02 −4.8148E−02 2.3018E−02 −7.9702E−03 R14 −4.6300E+00 −8.3411E−02 3.8981E−02 −1.6283E−02 4.9274E−03 −9.4385E−04 R15  1.9767E+00 −3.8717E−02 1.5265E−02 −4.6848E−03 9.2412E−04 −8.8582E−05 R16 −3.0000E+01 −4.4973E−02 1.6477E−02 −4.9836E−03 1.0741E−03 −1.6050E−04 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −1.7798E−01 −2.7382E−06   0.0000E+00 0.0000E+00 0.0000E+00 R2  2.8180E+00 5.1464E−03 −6.8830E−04 5.2598E−05 −1.7461E−06  R3 −9.9283E+00 7.8307E−03 −1.0409E−03 7.9167E−05 −2.6301E−06  R4 −8.8992E+00 8.2565E−03 −1.1958E−03 1.0128E−04 −3.8716E−06  R5  1.0000E+01 1.4996E−03 −1.4299E−04 5.2000E−06 2.1982E−08 R6 −2.0000E+01 −1.1103E−02   1.4718E−03 −1.0817E−04 3.3553E−06 R7  6.2310E+00 −2.1698E−03  −6.9741E−04 1.6839E−04 −1.1044E−05  R8 −5.0648E+00 3.6517E−03 −8.4597E−04 6.9983E−05 0.0000E+00 R9 −4.1867E+00 −2.0122E−04   0.0000E+00 0.0000E+00 0.0000E+00 R10 −1.0000E+01 −9.0052E−04   1.1183E−04 −5.8548E−06 0.0000E+00 R11  4.2881E−01 3.0054E−03 −7.2704E−04 8.9969E−05 −4.3953E−06  R12 −5.5456E+00 1.8709E−03 −2.6643E−04 1.5585E−05 0.0000E+00 R13  1.0000E+01 1.8285E−03 −2.4007E−04 1.3348E−05 0.0000E+00 R14 −4.6300E+00 1.0759E−04 −6.6882E−06 1.7513E−07 0.0000E+00 R15  1.9767E+00 1.0244E−06  5.0959E−07 −3.9186E−08 9.1935E−10 R16 −3.0000E+01 1.6449E−05 −1.1041E−06 4.3051E−08 −7.2550E−10 

In table 2, K is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients.

y=(x ² /R)/{1+[1−(k+1)(x ² /R ²)]^(1/2) }+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (1)

Herein, x denotes a vertical distance between a point in the aspheric curve and the optical axis, and y denotes an aspheric depth (i.e. a vertical distance between the point having a distance of x from the optical axis and a plane tangent to the vertex on the optical axis of the aspheric surface).

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (1). However, the present disclosure is not limited to the aspherical polynomials form shown in the formula (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of each lens of the camera optical lens 10 according to Embodiment 1. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optical axis of the camera optical lens 10.

TABLE 3 Number(s) Inflexion Inflexion Inflexion Inflexion of inflexion point point point point points position 1 position 2 position 3 position 4 P1R1 1 2.335 / / / P1R2 1 2.165 / / / P2R1 0 / / / / P2R2 0 / / / / P3R1 1 2.055 / / / P3R2 4 0.315 0.615 1.235 1.295 P4R1 2 0.645 1.485 / / P4R2 2 0.795 1.075 / / P5R1 0 / / / / P5R2 1 1.795 / / / P6R1 1 1.995 / / / P6R2 1 2.105 / / / P7R1 2 0.075 2.135 / / P7R2 1 0.465 / / / P8R1 3 2.115 2.495 3.035 / P8R2 2 0.135 3.355 / /

TABLE 4 Number(s) of Arrest point arrest points position 1 P1R1 0 / P1R2 0 / P2R1 0 / P2R2 0 / P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 0 / P5R2 0 / P6R1 0 / P6R2 0 / P7R1 1 0.125 P7R2 1 0.895 P8R1 0 / P8R2 1 0.235

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 10 in Embodiment 1, respectively. FIG. 4 illustrates a schematic diagram of a field curvature and a distortion with a wavelength of 546 nm after passing the camera optical lens 10 in Embodiment 1. A field curvature S in FIG. 4 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

In the subsequent Table 13, various parameters of Embodiments 1, 2 and 3 and values corresponding to the parameters specified in the above conditions are shown.

As shown in Table 13, Embodiment 1 satisfies the various conditions.

In this Embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 10 is 4.712 mm, an image height (IH) of 1.0H is 4.000 mm, and a field of view (FOV) in a diagonal direction is 47.30°. Thus, the camera optical lens 10 achieves large aperture, long focal length and ultra-thinness (in a camera optical lens with long focal length), the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 2

Embodiment 2, which provides a camera optical lens 20 structurally shown in FIG. 5, is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

The fifth lens L5 includes an image-side surface being concave in the paraxial region.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd νd S1 ∞ d0= −1.057 R1 3.091 d1= 1.285 nd1 1.5444 ν1 55.82 R2 5.144 d2= 0.066 R3 2.554 d3= 0.310 nd2 1.6800 ν2 18.40 R4 2.755 d4= 0.471 R5 20.293 d5= 0.991 nd3 1.5444 ν3 55.82 R6 −6.896 d6= 0.050 R7 10.472 d7= 0.320 nd4 1.6800 ν4 18.40 R8 4.730 d8= 0.747 R9 −24.596 d9= 0.380 nd5 1.6800 ν5 18.40 R10 68.656 d10= 0.527 R11 −6.797 d11= 0.550 nd6 1.6800 ν6 18.40 R12 −4.241 d12= 0.050 R13 84.473 d13= 0.500 nd7 1.5444 ν7 55.82 R14 6.448 d14= 1.339 R15 −9.214 d15= 0.500 nd8 1.5444 ν8 55.82 R16 43.254 d16= 0.400 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.445

Table 6 shows aspheric surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −1.5729E−01  1.3191E−03 −1.2658E−03  1.0167E−03 −3.4343E−04   5.4648E−05 R2  2.8125E+00 −1.7806E−01  2.1316E−01 −1.5012E−01 6.8707E−02 −2.1098E−02 R3 −1.0000E+01 −1.5783E−01  1.9694E−01 −1.3269E−01 5.4977E−02 −1.4356E−02 R4 −8.9108E+00 −4.7822E−02  6.0163E−02 −3.7372E−02 1.0966E−02 −1.1413E−04 R5  1.0000E+01  1.8766E−02 −4.5291E−03  3.7957E−04 −1.5538E−03   2.2890E−03 R6 −2.0000E+01  1.5017E−01 −2.3544E−01  2.0009E−01 −1.0366E−01   3.4298E−02 R7 −4.4841E+00  1.0014E−01 −2.0806E−01  1.6396E−01 −6.3714E−02   8.2557E−03 R8 −6.3153E+00 −7.2806E−03 −2.6724E−02  9.8863E−03 1.2670E−02 −1.3267E−02 R9  1.7965E+01 −5.1737E−03 −1.7338E−02  8.5114E−03 −2.6562E−03   3.7565E−04 R10 −1.0000E+01 −1.9910E−03 −1.6359E−02  1.0288E−02 −6.3309E−03   3.0028E−03 R11 −6.5101E−01  1.5408E−02 −1.9506E−02  1.2666E−02 −6.5314E−03   7.5412E−04 R12 −5.8111E+00 −1.9598E−02  1.8431E−02 −1.5267E−02 8.4090E−03 −3.8462E−03 R13 −1.0000E+01 −1.0022E−01  5.7057E−02 −3.6753E−02 1.8896E−02 −7.0458E−03 R14 −2.6436E+00 −7.0895E−02  2.6855E−02 −1.0497E−02 3.2576E−03 −6.4114E−04 R15  3.3743E+00 −3.7742E−02  1.7921E−02 −7.1935E−03 1.8985E−03 −3.0362E−04 R16 −3.0000E+01 −4.4422E−02  1.7969E−02 −6.1845E−03 1.4603E−03 −2.3061E−04 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −1.5729E−01 −3.4341E−06   0.0000E+00 0.0000E+00 0.0000E+00 R2  2.8125E+00 4.3262E−03 −5.6765E−04 4.2957E−05 −1.4227E−06  R3 −1.0000E+01 2.3673E−03 −2.3800E−04 1.3251E−05 −3.1395E−07  R4 −8.9108E+00 −7.3021E−04   1.7060E−04 −1.3645E−05  1.9196E−07 R5  1.0000E+01 −1.1117E−03   2.5628E−04 −2.8811E−05  1.2585E−06 R6 −2.0000E+01 −7.2637E−03   9.4515E−04 −6.8248E−05  2.0778E−06 R7 −4.4841E+00 2.7912E−03 −1.3214E−03 2.0725E−04 −1.1829E−05  R8 −6.3153E+00 5.2935E−03 −1.0049E−03 7.5280E−05 0.0000E+00 R9  1.7965E+01 −2.1053E−05   0.0000E+00 0.0000E+00 0.0000E+00 R10 −1.0000E+01 −8.7982E−04   1.3715E−04 −8.4226E−06  0.0000E+00 R11 −6.5101E−01 6.8018E−04 −3.0226E−04 4.7024E−05 −2.5059E−06  R12 −5.8111E+00 1.1473E−03 −1.8183E−04 1.1501E−05 0.0000E+00 R13 −1.0000E+01 1.7065E−03 −2.3173E−04 1.3123E−05 0.0000E+00 R14 −2.6436E+00 7.4061E−05 −4.6357E−06 1.2241E−07 0.0000E+00 R15  3.3743E+00 3.0055E−05 −1.8631E−06 6.8429E−08 −1.1545E−09  R16 −3.0000E+01 2.4189E−05 −1.6172E−06 6.1758E−08 −1.0122E−09 

Table 7 and table 8 show design data of inflexion points and arrest points of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 7 Number(s) Inflexion Inflexion Inflexion of inflexion point point point points position 1 position 2 position 3 P1R1 0 / / / P1R2 2 2.105 2.285 / P2R1 2 2.115 2.275 / P2R2 3 2.005 2.105 2.205 P3R1 1 1.995 / / P3R2 2 1.785 2.165 / P4R1 2 1.035 2.075 / P4R2 1 0.925 / / P5R1 1 0.615 / / P5R2 1 0.635 / / P6R1 1 1.965 / / P6R2 1 2.015 / / P7R1 2 0.445 2.215 / P7R2 2 0.615 2.475 / P8R1 1 2.775 / / P8R2 1 3.315 / /

TABLE 8 Number(s) of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 / / P1R2 0 / / P2R1 0 / / P2R2 0 / / P3R1 0 / / P3R2 0 / / P4R1 2 1.365 1.665 P4R2 0 / / P5R1 0 / / P5R2 1 0.625 / P6R1 0 / / P6R2 0 / / P7R1 1 0.175 / P7R2 1 0.885 / P8R1 0 / / P8R2 1 0.375 /

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 20 in Embodiment 2, respectively. FIG. 8 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 20 in Embodiment 2. A field curvature S in FIG. 8 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

As shown in Table 13, Embodiment 2 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 20 is 4.712 mm, an image height (IH) of 1.0H is 4.000 mm, and a field of view (FOV) in the diagonal direction is 47.30°. Thus, the camera optical lens 20 achieves large aperture, long focal length and ultra-thinness (in a camera optical lens with long focal length), the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 3

Embodiment 3, which provides a camera optical lens 30 structurally shown in FIG. 9, is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

The eighth lens L8 includes an image-side surface being convex in the paraxial region.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd νd S1 ∞ d0= −1.032 R1 3.048 d1= 1.550 nd1 1.5444 ν1 55.82 R2 7.388 d2= 0.050 R3 2.822 d3= 0.346 nd2 1.6800 ν2 18.40 R4 3.143 d4= 0.349 R5 108.042 d5= 0.684 nd3 1.5444 ν3 55.82 R6 −6.896 d6= 0.050 R7 38.699 d7= 0.320 nd4 1.6800 ν4 18.40 R8 4.660 d8= 0.771 R9 −14.909 d9= 0.380 nd5 1.6800 ν5 18.40 R10 −26.424 d10= 0.523 R11 −5.060 d11= 0.634 nd6 1.6800 ν6 18.40 R12 −3.691 d12= 0.050 R13 61.223 d13= 0.500 nd7 1.5444 ν7 55.82 R14 7.817 d14= 1.218 R15 951.291 d15= 0.577 nd8 1.5444 ν8 55.82 R16 8.651 d16= 0.400 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.519

Table 10 shows aspheric surface data of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −2.2602E−01  9.7046E−04 −1.2407E−03   8.5568E−04 −2.8584E−04   4.4379E−05 R2  4.6226E+00 −1.8957E−01 2.3630E−01 −1.6658E−01 7.5623E−02 −2.3095E−02 R3 −8.7718E+00 −2.1173E−01 2.6461E−01 −1.7940E−01 8.0347E−02 −2.5039E−02 R4 −9.7055E+00 −1.0164E−01 1.1878E−01 −8.4405E−02 5.1498E−02 −2.4809E−02 R5  1.0000E+01 −2.0820E−03 5.3230E−03  1.0692E−02 −8.2831E−03   2.2791E−03 R6 −1.6794E+01  1.4761E−01 −2.4404E−01   2.3471E−01 −1.3295E−01   4.5314E−02 R7  7.8820E+00  1.0864E−01 −2.8947E−01   3.1908E−01 −2.0101E−01   7.8157E−02 R8 −6.8699E+00 −1.0133E−02 −5.0898E−02   6.9023E−02 −4.0290E−02   1.2642E−02 R9  1.9213E+01 −5.6241E−03 −3.4681E−02   2.2231E−02 −4.3664E−03  −7.8005E−04 R10  3.5347E+00  6.3197E−03 −4.0093E−02   2.6301E−02 −1.0399E−02   4.0947E−03 R11 −3.5142E+00  3.8791E−02 −3.9622E−02   1.1019E−02 3.9623E−03 −6.6516E−03 R12 −5.2432E+00 −9.1301E−03 3.1365E−03 −4.4722E−03 1.9478E−03 −1.0028E−03 R13  1.0000E+01 −1.0256E−01 4.3285E−02 −1.3688E−02 9.5503E−04  7.1454E−04 R14 −3.9755E+00 −7.2259E−02 2.8214E−02 −1.0879E−02 3.1696E−03 −6.1377E−04 R15  1.0008E+01 −1.8911E−02 7.3782E−03 −3.7543E−03 1.1157E−03 −1.9391E−04 R16 −2.3168E+01 −2.1296E−02 7.2738E−03 −2.7559E−03 6.4636E−04 −9.4249E−05 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −2.2602E−01 −2.6436E−06   0.0000E+00 0.0000E+00 0.0000E+00 R2  4.6226E+00 4.7403E−03 −6.2568E−04 4.7688E−05 −1.5849E−06  R3 −8.7718E+00 5.4154E−03 −7.6615E−04 6.2707E−05 −2.2262E−06  R4 −9.7055E+00 8.0992E−03 −1.6112E−03 1.7551E−04 −8.0714E−06  R5  1.0000E+01 −2.3298E−04  −1.4590E−07 7.7304E−07 1.1290E−08 R6 −1.6794E+01 −9.3612E−03   1.1431E−03 −7.5706E−05  2.0921E−06 R7  7.8820E+00 −1.9147E−02   2.8902E−03 −2.4546E−04  8.9459E−06 R8 −6.8699E+00 −2.1438E−03   1.6203E−04 −1.5630E−06  0.0000E+00 R9  1.9213E+01 2.3299E−04  0.0000E+00 0.0000E+00 0.0000E+00 R10  3.5347E+00 −1.5466E−03   3.4071E−04 −2.8859E−05  0.0000E+00 R11 −3.5142E+00 3.7299E−03 −1.0961E−03 1.6261E−04 −9.4768E−06  R12 −5.2432E+00 4.3014E−04 −9.2953E−05 7.3826E−06 0.0000E+00 R13  1.0000E+01 −1.8762E−04   1.1133E−05 4.4348E−07 0.0000E+00 R14 −3.9755E+00 7.4406E−05 −5.1368E−06 1.5337E−07 0.0000E+00 R15  1.0008E+01 2.0749E−05 −1.3592E−06 5.0148E−08 −7.9735E−10  R16 −2.3168E+01 8.6920E−06 −4.9417E−07 1.5735E−08 −2.1298E−10 

Table 11 and Table 12 show design data of inflexion points and arrest points of each lens in the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 11 Number(s) of Inflexion Inflexion Inflexion Inflexion Inflexion Inflexion inflexion point point point point point point points position 1 position 2 position 3 position 4 position 5 position 6 P1R1 0 / / / / / / P1R2 3 0.285 0.775 2.085 / / / P2R1 3 0.475 0.685 2.125 / / / P2R2 1 2.035 / / / / / P3R1 1 2.025 / / / / / P3R2 6 0.375 0.685 0.795 1.265 1.645 1.935 P4R1 2 0.545 1.605 / / / / P4R2 2 1.365 1.815 / / / / P5R1 0 / / / / / / P5R2 1 1.695 / / / / / P6R1 1 1.975 / / / / / P6R2 1 2.095 / / / / / P7R1 2 0.125 2.145 / / / / P7R2 1 0.415 / / / / / P8R1 2 0.075 3.235 / / / / P8R2 2 0.735 3.615 / / / /

TABLE 12 Number(s) of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 / / P1R2 2 0.585 0.945 P2R1 0 / / P2R2 0 / / P3R1 0 / / P3R2 2 1.885 1.965 P4R1 2 0.845 1.835 P4R2 0 / / P5R1 0 / / P5R2 0 / / P6R1 0 / / P6R2 0 / / P7R1 1 0.205 / P7R2 1 0.765 / P8R1 1 0.115 / P8R2 1 1.365 /

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 30 in Embodiment 3, respectively. FIG. 12 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 30 in Embodiment 3. A field curvature S in FIG. 12 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

Table 13 in the following shows values corresponding to the conditions according to the aforementioned conditions in the embodiments. Apparently, the camera optical lens 30 in the present embodiment satisfies the aforementioned conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 30 is 4.712 mm, an image height (IH) of 1.0H is 4.000 mm, and a field of view (FOV) in the diagonal direction is 47.30°. Thus, the camera optical lens 30 achieves large aperture, long focal length and ultra-thinness (in a camera optical lens with long focal length), the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

TABLE 13 Parameters and conditions Embodiment 1 Embodiment 2 Embodiment 3 f/TTL 0.99 0.99 0.99 f2/f 4.43 3.47 3.10 (R5 + R6)/(R5 − R6) 0.24 0.49 0.88 f 9.000 9.000 9.000 f1 12.006 11.602 8.428 f2 39.866 31.238 27.898 f3 8.014 9.537 11.882 f4 −11.147 −12.817 −7.723 f5 −27.382 −26.249 −50.349 f6 13.821 15.052 16.658 f7 −11.014 −12.797 −16.446 f8 −14.324 −13.847 −15.972 f12 9.200 8.526 6.528 FNO 1.91 1.91 1.91 TTL 9.140 9.141 9.131 IH 4.000 4.000 4.000 FOV 47.30° 47.30° 47.30°

It will be understood by those of ordinary skill in the art that the embodiments described above are specific embodiments realizing the present disclosure, and that in practical applications, various changes may be made thereto in form and in detail without departing from the range and scope of the disclosure. 

What is claimed is:
 1. A camera optical lens comprising eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power; a second lens having a positive refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a negative refractive power; a sixth lens having a positive refractive power; a seventh lens having a negative refractive power; and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies conditions of: 0.95≤f/TTL; 3.00≤f2/f≤4.50; and 0.20≤(R5+R6)/(R5−R6)≤0.90; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens.
 2. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: 1.90≤d5/d4≤3.00; where d4 denotes an on-axis distance from an image-side surface of the second lens to the object-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.
 3. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: 0.47≤f1/f≤2.00; −8.45≤(R1+R2)/(R1−R2)≤−1.60; and 0.06≤d1/TTL≤0.25; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.
 4. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: −86.93≤(R3+R4)/(R3−R4)≤−12.39; and 0.02≤d3/TTL≤0.06; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.
 5. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: 0.45≤f3/f≤1.98; and 0.04≤d5/TTL≤0.19; where f3 denotes a focal length of the third lens; and d5 denotes an on-axis thickness of the third lens.
 6. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: −2.85≤f4/f≤−0.57; 0.64≤(R7+R8)/(R7−R8)≤3.97; and 0.02≤d7/TTL≤0.05; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.
 7. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: −11.19≤f5/f≤−1.94; −7.18≤(R9+R10)/(R9−R10)≤−0.31; and 0.02≤d9/TTL≤0.06; where f5 denotes a focal length of the fifth lens; R9 denotes a central curvature radius of an object-side surface of the fifth lens; R10 denotes a central curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.
 8. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: 0.77≤f6/f≤2.78; 1.98≤(R11+R12)/(R11−R12)≤9.59; and 0.03≤d11/TTL≤0.10; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.
 9. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: −3.65≤f7/f≤−0.82; 0.54≤(R13+R14)/(R13−R14)≤1.94; and 0.03≤d13/TTL≤0.08; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.
 10. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: −3.55≤f8/f≤−1.03; −1.70≤(R15+R16)/(R15−R16)≤1.53; and 0.03≤d15/TTL≤0.09; where f8 denotes a focal length of the eighth lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens. 